JPH0561122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an air flow rate control device in a vehicle air conditioner, and particularly to an air flow rate control device when heating is started.

(Prior art) Conventional air flow control is described in, for example, Japanese Patent Application Laid-Open No. 63-2717.
As disclosed in the above publication, the blower air volume is controlled based on the outside air temperature and the engine coolant temperature, and furthermore, the blower air volume is controlled to increase when the outside air temperature is low and the cooling water temperature is low. .

In addition, as disclosed in Publication No. 10166/1983, even if the engine cooling water temperature is high to a certain extent, if the outside air temperature is not high, the blower rotation is controlled to stop to prevent cold air from hitting the occupants. Even when the cooling water temperature is relatively low, if the outside air temperature is high to a certain extent and the temperature at which the hot air is blown rises, the blower is rotated to quickly provide a feeling of heating to the occupants.

(Problems to be Solved by the Invention) In the conventional air blowing amount control as described above, the engine cooling water temperature is detected and the air blowing amount is controlled in accordance with the detected temperature.

However, if the engine coolant temperature is detected by inserting a sensor into the engine coolant pipe, accurate temperature can be detected. However, it is difficult to attach sensors to piping.

For this reason, the engine coolant temperature is indirectly measured by measuring the core side temperature of the heater core. In this case, there was a problem that the response was delayed more than when directly measuring the engine coolant temperature, and optimal startup control could not be performed.

Another problem was that the response delay was affected by the outside temperature.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air flow rate control device for a vehicle air conditioner, which can perform optimal startup control even if water temperature is indirectly detected.

(Means for Solving the Problems) As shown in FIG. 1, the air blowing amount control device in the vehicle air conditioner of the present invention controls the air blowing amount during automatic control related to the deviation between the indoor air temperature and the set temperature. A first calculating means 1 that calculates a signal, an outside temperature detecting means 2, a water temperature detecting means 3 that detects a temperature related to the engine cooling water temperature, and a water temperature detected by the water temperature detecting means 3 when the heating is started is a predetermined temperature. The air flow rate signal increases at a first slope until reaching the predetermined temperature, and after reaching the predetermined temperature, the air flow rate signal increases at a second slope that is greater than the first slope.
a second calculation means 4 that calculates an air flow rate signal that increases with a gradient of , a correction means 5 that corrects the predetermined temperature with the outside air temperature, and a calculation air volume signal calculated by the first calculation means 1 and the second calculation means. Selection means 6 for selecting one of the calculated airflow rate signals according to 4.
Then, the selection means 6 selects the airflow amount calculated by the second calculation means 4 until the airflow amount signal calculated by the first calculation means 1 and the airflow amount signal calculated by the second calculation means 4 coincide for the first time during heating startup. a first control means 7 which causes the selection means 6 to select the calculated air flow rate signal by the first calculation means 1 after the first coincidence; This device is characterized in that it includes a second control means 8 that controls the blower to a corresponding air flow rate.

(Function) When heating is started, the blower air volume is controlled to be the air volume corresponding to the calculated air volume signal from the second calculation means 2 until the air volume of the blower reaches the air volume corresponding to the air volume signal calculated by the first calculation means 1. Ru. In this case, the air flow rate signal calculated by the second calculation means 2 is increased at the first gradient until the water temperature detected by the water temperature detection means 3 reaches a predetermined value, and after the water temperature reaches the predetermined value, Since the air flow rate is increased at the second slope, which is larger than the first slope, when heating is started, the air flow rate of the blower increases at the first slope until the water temperature reaches the predetermined temperature. After that, the amount of air blown by the blower increases at a second gradient. Furthermore, the predetermined temperature described above is corrected based on the outside air temperature.

Therefore, since the engine cooling water temperature is indirectly detected by the water temperature detection means 3, even if the water temperature detected by the water temperature detection means 3 deviates from the engine cooling water temperature, it is corrected by the outside air temperature. , the above-mentioned deviation is corrected and stable air flow control is performed when heating is started.

(Example) The present invention will be explained below with reference to Examples.

FIG. 2 is a block diagram showing the configuration of a vehicle air conditioner to which an embodiment of the present invention is applied.

An intake door 16 is provided on the upstream side of the duct 15 to change the ratio of outside air to vehicle interior air in intake air, and the intake door 16 is controlled by a motor actuator 17. Air sucked by the blower 18 through the intake door 16 is sucked into the duct 15, and an evaporator 19, a mix door 20, a heater core 21, and mode switching doors 22 and 23 are sequentially arranged on the downstream side of the blower 18. It has been set up. The evaporator 19 constitutes a part of a cooler consisting of a compressor 28 that compresses and circulates refrigerant, a condenser 29, a receiver tank 30, and an expansion valve 31. The rotational force from the pulley 32 is transmitted via the magnetic clutch 33. The heater core 21 is supplied with cooling water for an on-vehicle engine and functions as a heater. Evaporator 1
The ratio of the air passing through the mixer door 9 and the air flowing to the heater core 21 is changed depending on the opening degree of the mixer door 20, and the amount of heating is adjusted by adjusting the amount of cooling water supplied to the heater core 21 in accordance with the opening degree of the mixer door 20. will be done. The mix door 20 is driven by a motor actuator 34.

The mode switching doors 22 and 23 are used to select the vent outlet 25, the defrost outlet 26, and the heat outlet 27 to blow out conditioned air into the vehicle interior 24. The mode switching doors 22 and 23 are driven by a motor actuator 35. Here, the vent outlet 25 is set so as to blow air to the face of the occupant, and the heat outlet 27 is set so as to blow air from the feet of the occupant.

Reference numeral 36 denotes a control circuit, which is composed of a microcomputer. The control circuit 36 includes an inside air temperature sensor 3 provided at a position representative of the temperature inside the vehicle interior 24.
7. Temperature sensor (hereinafter referred to as evaporator temperature sensor) 38 that detects the temperature of the air passing through the evaporator 19 or the temperature of the evaporator outlet side fins, for example, the temperature at point A; a solar radiation sensor 39 that detects the amount of solar radiation; and a solar radiation sensor 39 that detects the outside air temperature. an outside air temperature detection sensor 40, a water temperature sensor 41 that is installed on the side of the heater core 21 and indirectly detects the engine cooling water temperature, a temperature setting device 42, and a mixer door 20.
Data obtained by converting the output of a potentiometer 43 that detects the opening degree of the valve into digital data via an A/D converter 44 is supplied. Furthermore, the control circuit 3
6 is a switch 45 that works with the engine switch.
The output is supplied.

The control circuit 36 stores a central processing unit (CPU), a ROM that stores programs, and data.
The control circuit 36 is equipped with a RAM, and the control circuit 36 operates according to a program stored in the ROM, including a drive circuit 46 that drives the motor actuator 17, a drive circuit 47 that drives the blower 18, and a drive circuit that drives the clutch 33. 48, the drive circuit 49 that drives the actuator 34 and the drive circuit 50 that drives the actuator 35 are controlled to open the intake door 1.
6, the operation timing and period of the cooler including the evaporator 19, the opening of the mixer door 20, and the mode switching doors 22 and 23, respectively, to bring the vehicle interior temperature to the target temperature. do.

The explanation will be based on the program stored in the ROM. Execution of the program is started by closing the engine switch, and initial settings such as clearing the memory contents of the RAM are performed (step S ₁ ). The output from the A/D converter 44 is then read through the input port of the control circuit 36;
The switch 45 is stored in a predetermined area of RAM, and then the switch 45 is turned on when the engine switch is turned on.
The output of RAM is read through the input port
The memory content of the second flag area is logic “1”
(set), and the total data T is calculated and stored (step S ₂ ).

The calculation of the total data T is performed as follows: T=T ₁ +aT _A +bT _SU +cT _E −dT _ST +K ₁ (1). Here, T ₁ represents the inside air temperature detected by the inside air temperature sensor 37, T _A represents the outside air temperature detected by the outside air temperature sensor 40, T _SU represents the amount of solar radiation detected by the solar radiation sensor 39, and T _E indicates the evaporator outlet temperature detected by the evaporator temperature sensor 38, and T _ST indicates the temperature set by the setting device 42. a, b, c, d and K ₁ are constants. Therefore, the comprehensive data T is obtained by correcting the deviation between the set temperature and the interior air temperature using the outside air temperature, the amount of solar radiation, and the evaporator outlet temperature.

Following step _S2 , the air flow rate is controlled (step _S3 ). When the heating start-up is completed, the air flow rate control is performed by supplying the blower drive voltage V to the blower drive motor according to a predetermined pattern based on the total data T as shown in FIG. 4a. This pattern is stored in advance in the ROM as a table of total data T and values B _AUTO corresponding to the drive voltage V for the total data T.
Air flow control will be described later. In addition, in Fig. 4a, the side where the comprehensive data T is less than T ₀ is the heating side,
The side above T ₀ is the cooling side.

Temperature control is performed following step _S3 (step _S4 ). Temperature control is driven by compressor 28.
The vehicle interior air temperature T ₁ is controlled by controlling the amount of heat exchanged between the intake air and the evaporator 19 and the amount of air flowing to the heater core 21 through the stop control and the opening degree control of the mix damper 20 .

Following step _S4 , mode control is performed to control the mode dampers 22 and 23 (step _S5 ).
Step _S1 is executed again.

Next, air blowing amount control will be explained with reference to FIG. 5.

When entering the air blowing amount control step _S3 , it is checked whether the total data T is T< _T0 (step _S30 ).
When it is determined in step _S30 that T<T ₀ , the case is heating, and when it is determined that T≧T ₀ , the case is cooling.

When it is determined in step _S30 that T≧ _T0 , the air flow rate is controlled in accordance with the pattern shown in FIG. 4a following step _S30 (step _S32 ), and then step _S4 is executed. be done.

When it is determined in step _S30 that T< _T0 , it is checked following step _S30 whether the memory contents of the first flag area of the RAM are set to logic "1" ( Step S ₃₁ ).
When it is determined that the stored content of the first flag area is logical "1", step _S32 is executed following step _S31 . The air flow rate control in step _S32 will be described later. As will be clear from the description below, when step _S32 is executed, air flow control at the time of starting heating has been completed and the system has entered the so-called automatic air conditioner state.

If the memory content of the first flag area is not logic "1" in step _S31 (when it has been reset), it is determined whether the memory content of the second flag area is logic "1" (set) following step _S31 . is checked (step _S33 ). When the engine switch is closed, the memory contents of the second flag area are set to logic "1". When it is determined in step _S33 that the memory content of the second flag area is logical "1", following step _S33 , the RAM drive voltage information area (hereinafter referred to as B _WU area) is
Information corresponding to the S.LOW value, that is, the low drive voltage is stored, and the stored contents of the B _WU area are sent to the drive circuit 47 to drive the blower 18.
In this case, the voltage applied to the blower motor is a low drive voltage and a low air flow rate (step
_S34 ). Following step _S34 , it is checked whether the water temperature T _W detected by the water temperature sensor 41 is [T _W >15+1/2× _TA ] (step _S35 ), and in step _S35 , [T _W ≦15+1/2×T _A ], the S・LOW value is stored in the B _WU area,
The blower 18 continues to be driven (step _S36 ).
At step S ₃₅ , the water temperature is [T _W > 15 + 1/2T _A ]
If it is determined that it is, then following step _S35 , it is checked whether the water temperature is [T _W >25+1/2× _TA ] (step _S37 ). If the water temperature is determined to be [T _W ≦25+1/2×T _A ] in step _S37 , the step
Following S ₃₇ , “+△X” is added to the memory contents of B _WU area.
is added (step _S38 ). Therefore, each time step _S38 is executed, the memory contents of the B _WU area are changed to S.
LOW+△X, S・LOW+2△X, S・LOW+
3 _△ On the other hand, since the stored contents of the B _WU area are sent to the drive circuit 47 every time they change, the drive voltage of the blower motor increases by a value corresponding to ΔX every time step _S38 is executed. As a result, the amount of air blown is sequentially increased in accordance with ΔX.

At step S ₃₇ , the water temperature is [T _W > 25 + 1/2 ×
If it is determined that _TA ], then "+ΔY"(ΔY>ΔX) is added to the memory contents of the B _WU area following step _S37 (step _S39 ). Therefore step
Every time S ₃₉ is executed, the memory contents of B _WU area are S・LOW
+△Y, S・LOW+2△Y, S・LOW+3△
Y, ... (denoted as delay type []), or B _WU +△Y, B _WU +2△Y, B _WU +3
△Y..., and the memory contents of the B _WU area increase stepwise by △Y. Therefore, each time step _S39 is executed, the drive voltage of the blower motor is △
The value corresponding to Y increases. As a result, the amount of air blown is sequentially increased in accordance with ΔY.

Following steps S ₃₆ , S ₃₈ and S ₃₉ , a check is made to see if the content stored in the B _WU area is greater _than or equal to the value stored in the ROM corresponding to the total data T computed immediately before step S ₃ . (step)
_S40 ). If _the memory content of the B _WU area is less than B _AUTO in step S ₄₀ , the second
The memory contents of the flag area are logic “0” (reset)
(step _S41 ) and step _S4 is executed.
Therefore, even if the engine switch is not turned off, the memory contents of the second flag area are set to logic "0" in step _S40 , so that when the next air blow rate control is performed, the steps start from step _S33 . _S35 is executed and step _S34 is skipped.

Here, as is clear from step _S32 and step _S41 , logic "1" is stored in the second flag area only when the engine switch is closed, and the closed state continues. However, after a predetermined period of time when the gate is closed, it becomes logic "0".

When the stored content of the _BWU area is the value _BAUTO in step _{S40 ,} the stored content of the first flag area is set to logic "1" (step _S42 ). Following step _S42 , step _S32 is executed.

As is clear from steps S ₃₀ , S ₃₁ , S ₃₂ , S ₃₃ , S ₄₀ and S ₄₂ , steps S ₃₀ and S ₃₁ are steps for determining whether or not the heating is activated.

In addition, in step _S32 , the value B _AUTO , which was determined in step _S40 , is transferred to the B _WU area, and the memory contents of the B _WU area are sent to the drive circuit 47, so that the blower motor is set to correspond to the value B _AUTO . It will be driven by the driving voltage.

The state of air flow control at the time of starting the heating explained above is as shown in FIG. 4b. In addition, T _W
>15+1/2T _A , step as T _W >25+1/2T _A
S ₃₅ and S ₃₇ were checked for the former T _W > 15
At +1/2T _A , the water temperature T _W is such that the air temperature blown into the passenger compartment 24 does not give a feeling of cold air.
In the latter case, T _W >25+1/2T _A , this is to check whether the blown air temperature has reached a water temperature T _W sufficient to warm the passenger compartment 24.

In addition, in the above embodiment, the total data T and the value B _AUTO table for the total data are stored in advance in the ROM, and the table is retrieved to retrieve the value.
Although the case where B _AUTO is obtained is illustrated, the value B _AUTO may also be calculated from the pattern shown in FIG. 4a for the total data T.

(Effects of the Invention) As explained above, according to the present invention, water temperature (T _W )
The air is blown at the first slope until it reaches a predetermined value corrected by the outside air temperature, and when it exceeds the predetermined value, it is blown at the second slope (second slope > first slope). _The water temperature (T _{W )} is detected at can be eliminated.

Further, since the determination value of the water temperature (T _W ) is corrected based on the outside air temperature, the above-mentioned effects can be further enhanced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. Second
The figure is a block diagram showing the configuration of an embodiment of the present invention.
3 and 5 are flowcharts for explaining the operation of one embodiment of the present invention. FIGS. 4a and 4b are diagrams for explaining the operation of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...First calculating means, 2...Outside temperature detecting means, 3...Water temperature detecting means, 4...Second calculating means, 5...Correction means, 6...Selecting means, 7...First Control means, 8...Second control means, 18...Blower, 36...Microcomputer, 40...Outside air temperature sensor, 41...Water temperature sensor, 47...Drive circuit.

Claims (1)

[Claims] 1. A first calculation means that calculates an air flow rate signal during automatic control related to the deviation between the interior air temperature and the set temperature, an outside air temperature detection means, and a water temperature detection device that detects a temperature related to the engine cooling water temperature. means, an air flow rate signal that increases at a first slope until the water temperature detected by the water temperature detection means when starting the heating reaches a predetermined temperature, and a second slope that is larger than the first slope after reaching the predetermined temperature. a second calculating means for calculating an air blowing amount signal that increases at , a correcting means for correcting the predetermined temperature with an outside temperature, a calculated air blowing amount signal by the first calculating means and a calculated air blowing amount signal by the second calculating means; a selection means for selecting one of the calculated airflow volume signals; and a selection means for selecting one of the calculated airflow volume signals from the first calculation means, and a selection means for selecting one of the calculated airflow volume signals from the first calculation means until the calculated airflow volume signal from the first calculation means and the calculated airflow volume signal from the second calculation means coincide for the first time during heating startup. a first control means for causing the selection means to select the calculated air blowing amount signal by the second calculating means, and after the first coincidence, causing the selection means to select the calculated air blowing signal by the first calculating means; 1. A blowing volume control device for a vehicle air conditioner, comprising: second control means for controlling a blower to a blowing volume corresponding to an air volume signal.